//清除浮动
@mixin clearfix{
  *zoom: 1;
  &:after{
    content: '';
    display: block;
    clear: both;
    line-height: 0;
    visibility: hidden;
  }
}
//永不换行
@mixin nospace{
  // width: 100%;
  disply:block;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
}
